If I use the Anvil natively with the large MP, I heat it up to the second click.
To maintain the same roach, if I use it the WPA loaded to the prophet dry rig, I warm up till the first click.
So it really depends on how you are using it (natively, attached to a bong or using WPA).
After that, it is all depending on the firepower, i.e. small flame, large flame or using the outer flame etc.
Better using a only one torch and a fixed way of using (i,e, natively) it and experiment on the flame, from there.
In general, if I finish half bowl in one single draw, the roach is perfectly even.
From the second draw and/or third, usually on the full bowl, the roast is somehow uneven, and the closest to the base of the cap, the more dark ABV. Therefore, I usually reach the half bowl, and try to finish in one draw